Apparatus for installing and guiding pipe or the like



Feb. 127, 1934. w. H. ROBERTSON 1,948,733

APPARATUS FOR INSTALLING AND GUIDING PIPE OR THE LIKE Filed July 18. 1932 2 Sheets-Sheet l fl f'a 17 4. 11 16 27 1 1211 Feb. 27, 1934. w H, RQBERTSON 1,948,733

APPARATUS FOR INSTALLING AND GUIDING PIPE OR THE LIKE Filed July 18. 1932 2 Sheets-Sheet 2 Patented Feb. 27, 1934 PATENT OFFICE APPARATUS FOR. INSTALLING AND GUIDING PIPE OR THE LIKE Walter H. Robertson, North Plainfield, N. J assignor to Massey Concrete Products Corporation, Chicago, 111., a corporation of Virginia Application July 18, 1932. Serial No. 623,179

12 Claims. (01. 61-84) The present invention relates to a method and apparatus for installing and guiding pipe, such as the concrete pipe which is employed for making culvert and sewer pipes. It should be understood, however, that the invention is of general application and applicable to all kinds of pipe, and it may also be used for installing other similar structures.

When culvertand sewer pipes are installed in 1 roads or under railroad tracks by the usual method of trenching, there is considerable interference with the operation of the road or track, and the trench method leaves a soft spot where the earth is refilled into the trench, and such soft spots re- 15 quire frequent maintenance. Where a tunneling method is used, it is necessary to support the track with piles and timbers, and this is very expensive. Furthermore, objection is made to leaving the old timbers, necessary to support the work, to rot in place, and the back filling between the pipe and the timbers may not be carefully compacted, both of which might cause settlement and subsequent disturbance to the track.

All of the foregoing disadvantages may be eliminated by the installation of the pipe for culvert or sewer by jacking or otherwise forcing the pipe through the earth underneath the road or railroad track, the earth being excavated from the inside of the pipe at the forward edge of the pipe.

One of the objects of the present invention is the provision of an improved method and apparatus for installing and/or guiding concrete pipe or the like without the necessity for trenching or utilizing timbers to support the earth dur- 5 ing the excavation of the hole for the pipe.

During the installation of pipe, such as concrete pipe, according to, the present method, there is often a tendency for the pipe to get out of alignment. The weight of the pipe and the character of the material in which the excavation is made affect the alignment of the pipe. For instance, the weight tends to cause the forward end of the pipe to go down, and the drop of the forward end of the pipe is apt to be greater in soft materials, such as soft clay. The alignment of the pipe isalso affected by unequal application of force to the pipe by the jacks, by the tendency of the workmen to dig too deep on one side or the other of the pipe, generally the lower side, and

by the presence of obstructions.

Another object of the invention is the provision of an improved method and apparatus which are adapted to eliminate the difficulty otherwise experienced in maintaining the pipe on the selected line and grade.

Another object of the invention is the provision of an improved guide shoe for use in guiding the pipe and progressively afiecting or changing the direction of movement of the end of the pipe in order to maintain the line and/ or grade of the pipe or to bring the pipe back to the proper line and grade.

Another object of the invention is the provision of an improved guide shoe for installing pipe, which may be constructed out of ordinary stock metal members, and which is adapted to be utilized for installing concrete pipe.

Another object of the invention is the provision of a plurality of modified forms of guiding devices for concrete pipe or the like, each of which possesses special advantages by virtue of its particular construction and form, and some of which are peculiarly adapted to be adjusted as the installation of the pipe progresses, so that the pipe may be jacked. for a short distance and then the line and grade checked and. proper adjustment made to maintain the pipe at proper line and grade, or to bring the pipe back to the desired position in subsequent jacking Operations.

Other objects and advantages of the invention will be apparent from the following description and from the drawings, in which similar characters of reference indicate similar parts throughout the several views.

Referring to the drawings, of which there are two sheets, i

Fig. 1 is a vertical sectional view taken through an apparatus adapted to be used for the installation of concrete pipe according to the presentmethods, showing the pipe in the course of installation;

Fig. 2 is a top plan view of the same apparatus and pipe with the fill removed from the top of the pipe to expose the pipe and guide shoe;

Fig. 3 is a vertical sectional view taken on the plane of the line 3-3 of Fig. 2, looking in the direction of the arrows, showing the guide beams and wooden jacking head for distributing the pressure on the concrete pipe;

Fig. 4 is a fragmentary top plan view of the guide shoe shown in Figs. 1 and 2;

Fig. 5 is a fragmentary sectional view of the guide shoe shown in Fig. 4, taken on the plane of the line 5-5 of Fig. 4, looking in the direction of the arrows;

Fig. 6 is a sectional view taken on the plane of the line 6-6 of a modified form of guide shoe shown in elevation in Fig. 7, and adapted tobe adjusted to change the direction of movement of the pipe as desired during its installation;

Fig. 7 is an end elevation of the guide shoe shown in Fig. 6;

Fig. 8 is a vertical sectional view taken on the plane of the line 88 of Fig. 9, showing a modified form or" guide shoe in which the adjustable shoe is supported in advance of he concrete pipe;

Fig. 9 is an end elevational view of the guide shoe of Fig. 8;

Fig. 10 is a vertical sectional view taken on the plane of the line 1010 of Fig. 11, showing an improved and simplified form of guide shoe which may be constructed out of ordinary stock metal shapes, such as angle irons, rivets and bolts, thereby eliminating the necessity for any special structural work; I

Fig. 11 is an end elevational view of the guiding device illustrated in Fig. 10, with a fragment of the pipe;

Fig. 12 is a vertical sectional view of a fragment of pipe equipped with a cutting ring adapted to be used to facilitate the installation of the pipe.

Referring to Figs. 1 to 3, 10 indicates in its en'- tirety the embankment, fill, or roadway under which it is desired to install the culvert or sewer pipe, comprising a plurality of sections 11. The pipes 11 are preferably large enough to permit a man to work inside the pipe without discomfort. Experience shows that it is cheaper and more convenient to install a larger pipe according to the present method, as the time saved will often offset the difference in price. Concrete pipe is admirably suitable for installation by the application of force with a jack or otherwise, as shown in Fig. 1, by reason of its high compressive strength. The pipe is preferably provided with a relatively smooth exterior surface 12 to offer the least frictional resistance, and while the cross sectional shape of the pipe may be of any suitable configuration, the pipe is preferably substantially cylindrical.

The pipe is preferably also of the tongue and groove type, the tongue being shown at l3,'and the groove at the opposite end 14 of the pipell.

The tongue and groove serve to provide a tighter joint, and also to maintain the successive sections of pipe in alignment with each other during the installation and after the pipe has been installed. The joints are preferably grouted at 13, 14 when the pipe is put together and the installation completed as soon as possible so that when the grout sets a water-tight joint will be provided, but in some embodiments of the invention where a water-tight joint is notessential, the grout may be omitted.

a guide shoe to the pipe at any point desired at the groove end of the pipe. The groove end of the pipe is preferably utilized for the forward or advancing end of the pipe in the fill 10 for the reason that the outer surface of the groove .end of the pipe is substantially smooth, presenting no shoulder which might retard the entrance of the pipe. The shoulder in the groove 14 on the inside of the pipe presents no obstruction, since. excavation is carried on from the in-- side of the pipe.

It is necessary to provide a resisting surface against which the jacks may react, and therefore if a shaft or bank of earth is not available, a timber dead man must be constructed to take the load. In the embodiment shown in Fig. 1, the

load is taken by a timber dead man 16 which engages the bank 17. The hole 18 which is dug adjacent the fill 10 is of suiiicient size to accommodate the necessary apparatus and to leave adequate room from for the workmen. It may be provided with a concrete foundation 19 within which are embedded a plurality of transverse timbers 20. The transverse timbers 20 support a plurality of longitudinally extending timbers 21, 22, 23 which are located and supported in recesses in transverse timbers 24 in such manner that their upper surfaces 25 are located substantially tangent to the circumference of the pipe. The pipe sections 11 are thus preferably supported at three points throughout their length, and the longitudinally extending timbers 21, 23 are adapted to serve as guides for slidably engaging the pipe and starting it in the proper direction with regard to the selected line and grade.

All three of the guide timbers 21, 22 and 23 determine the grade of the culvert or sewer, while the side timbers 21 and 23 engage the sides of the pipes adjacent the bottom and determine the direction of the pipe with regard to the cmbankment in an approximately horizontal plane.

In starting a concrete pipe, it is sufiicient to use one jack against the bottom of the pipe with a plurality of timbers preferably interposed between the tongue end or the pipe and the jack 26 to distribute the load over a larger area at the end of the pipe. The application of the jack to the lower part of the pipe tends to maintain the grade direction better than if it were applied at any other point, since the application of force at the lower edge of the pipe tends to raise the advancing end and counteract the tendency toward a drop. As the work progresses other jacks are added, being preferably symmetrically located with respect to the circumference of the pipe, and when a predetermined amount of resistance is encountered it is necessary or desirable to use a timber jacking head 27.

The timber jacking head 2'7 comprises a plurality of bearing blocks 28, such as, for example,

blocks of twelve inch by eight inch material, suit- 120 ably shaped so that four blocks will engage the tongue end over the entire periphery of the pipe. The blocks preferably curved similar to the size of the pipe at their outer edges, and the successive layers of blocks are staggered with respect to each other and secured to each other by nails, bolts, or other suitable securing devices so that the thrust upon the jacking head from the jacks is uniformly distributed over the entire end area. of the pipe 11.

The jacking head is provided with a centrally located aperture 29 through which the material may be removed from the pipe 11 as the excavation progresses.

The jacks 26 may consist of any suitable type of force multiplying mechanism adapted to provide a suflicient thrust against the end of the pipe. Both screw jacks and hydraulic jacks have been found to give satisfactory service, but the jacks are preferably of a type which can be released quickly so as to save time in their manipulation, since the jacks must be brought back to initial position whenever another section of pipe is inserted between the jacking head 27 and the pipe already installed. Of course, the range of movement of the jack should be suificient to force a full length of pipe 11 into place without necessity for changing the blocking between the jack and the pipe, as otherwise a great deal of time may be lost in manipulating the jacks and blocking.

The jacks are preferably continuously operated while the excavation progresses at the same 1 time, but the jacking and excavation may proceed alternately, provided the excavation does not proceed too far in advance of the jacking operation. Experience indicates that it is not advisable to excavate more than six inches ahead of the pipe, especially if the material is loose sand or material which will flow. If the material of the fill is such that the material will arch, it is well to excavate the hole ahead of the pipe about one inch larger in diameter than the pipe to reduce the friction on the pipe. The best results are secured in a long culvert and in noncompressive material like sand or coarse gravel byoperating continuously and maintaining pressure on the line so that the surrounding material will not pack excessively around the pipe.

' Referring to 12, indicates in its entirety a metal cutting ring which may be provided for the forward edge of the concrete pipe. The cutting ring 30 may comprise a substantially cylin- .drical band of sheet metal 31 of sufficient size to fit over the end of the pipe.

The inner surface 32 of the band slidably engages the outer surface 12 of the pipe. The band 31 is preferably provided with an annulus 33 having a cylindrical flange 34 and a radially inwardly extending flange 35. The cylindrical flange 34 fits in side the cylindrical band 31 and may be secured thereto by spot-welding or by a plurality of rivets 36, preferably slightly spaced from the outer or cutting edge 37 of the ring 30. The radially extending flange is adapted to provide a shoulder to engage the end 38 of the tongue on the forward end of the pipe. Such a metal cutting edge helps materially to keep the pipe to the correct line and grade, and, if desired, the ring 30 may be equipped with suitable flanges for further effecting a guiding action of the end of the pipe.

Referring to Figs. 1 and 5, the forward pipe section in these figures is provided with an improved guide shoe 39 of a simple type, which comprises a metal plate 40 adapted to engage the outside of the pipe 11. The plate 40 is provided with a pair of apertures 41 for receiving the threaded bolts 42, which pass through the apertures 15 in the concrete pipe, and the plate 40 is secured by means of the washers 43 and nuts 44. The outer end of the plate 40 is bent inwardly toward the center of the pipe, forming an acute angle at the point 45, and forming a guide flange 46 which tends to cam against the adjacent fill and produce a vertical component of force as the pipe progresses.

The strain on the bolts 42 is relieved by providing an angle iron having a radially inwardly extending flange 47 engaging the end 38 of the pipe and having an outwardly extending flange 48 which may be secured by rivets 49, spot-welding, or other convenient fastening means to the guide flange 46. When the guide shoe 39 is secured to the upward pipe section 11, as shown in Fig. 1, its tendency is to provide a vertical component of force through the camming action of the flange 46, which counteracts the tendency of the pipe to drop, and thereby maintains the grade of the pipe. Guide shoes 39 may likewise be attached to either or both of the sides of the pipe before or during the installation of the pipe. If it is desired to install a guide shoe on the pipe during the installation, it is obviously necessary to excavate around the forward edge of the pipe sufficiently to put the guide flange in place. However, the guide shoe may be applied at any time when a check of the grade and line of the pipe indicates that an action of the guide shoe is required.

- Referring to Figs. 6 to 11, these are views of improved forms of apparatus. or guiding devices which permit the installation of the pipe, and the adjustment and maintenance of the grade and line with greater facility than any of the devices previously described. The guiding device shown in Figs. 6 and 7 comprises a supporting plate 50 preferably provided with inwardly extending reinforcing flanges 51, 52 and with a radially outwardly projecting shoulder flange 53 for abutting the end 54 of the pipe. The supporting plate 50 is preferably provided with apertures 55 for receiving the screw bolts 56 which pass through apertures 5'? in the pipe to secure the plate 56 to the end of the pipe. The pipe is preferably provided with counterbores 58 for receiving the head and washer of the bolts 56.

At its forward end, the supporting plate is provided with a plurality of downwardly extending lugs 59, 60, 61, with slots 62, 63 between the lugs 59---60 and the lugs 60-61. The lugs 59-61 are provided with transverse bores 64 in alignment with each other and adapted to receive a cylindrical hinge pin 65 which has apertures 66 at each end for receiving cotter-pins 67.

The guide shoe proper 68 comprises a metal member which is preferably provided with a substantially flat plate having a pair of flat surfaces 69, '70 at an angle to each other, the apex '71 being located along the line of the direction of movement of the pipe. The guide shoe plate 68 has a pair of upwardly extending lugs 7273 which are provided with circular bores '74 for receiving the hinge pin 65. The guide shoe 68 is thus pivctally mounted on the hinge pin 65 and adapted to be moved to any of a plurality of different positions for changing its guiding action upon the pipe 11. The guide shoe 68 extends backward from the lugs 72, '13 outside of the pipe 11, and it may be moved from the full line position shown in 6 to the dotted line position. The tendencies of the forces exerted upon the front of the guide shoe 68 and upon the surfaces 69, '70 are to force the guide shoe into engagement with 125 the outer surface 12 of the pipe, and, therefore, in order to provide for the adjustment of the guide shoe 68 the device is provided with an adjustment bolt '75. The pipe 11 is preferably provided with an aperture "/6 for the screw bolt "(5 30" and with a non-circular socket 7'7 for receiving a nut 78. The bolt '15 is threaded over the major portion of its length and may be provided with a transverse aperture '79 through its head for re ceiving a pin, used to adjust the bolt, or it may 135 be provided with a non-circular head.

A look nut 80 engaging the upper surface of the supporting plate 50 secures the bolt more firmly in any predetermined adjusted position. The shoe 68 is adjusted by releasing the lock nut 140 80 and turning the head of the bolt in a clockwise direction if it is desired to cause the shoe 68 to deflect the pipe upward to a greater degree. Adjustment of the bolt in the opposite direction will accomplish the opposite result.

Spacers 81 interposed between the supporting plate 50 and the interior surface of pipe 11 may be utilized to make the supporting plate 50 fit against the curved surface of the pipe or the supporting plate 50 may itself be made curved. By 156 the use of spacers of different curvature, the same supporting plate 50 may be made adaptable for use on pipes of different diameter.

Referring to Figs. 8 and 9, these are fragmentary views of a pipe equipped with a guiding device of a different type adapted to predeterinine the line and/or grade. In this guiding device, the guide shoe is located in advance of the pipe. The guiding device may comprise a similar supporting body 50 which is elongated beyond the lugs 59-81 to provide a, forwardly projecting end 82 adjacent the forwardly projecting guide shoe 83. The guide shoe 83 may be similar in shape to the guide shoe 68 previously described, except that it is reversed in position with respect to the supporting body 50 and has its end projecting forward. The guide shoe is preferably provided with a stop bolt 84. which may have its headed end 85 fixedly secured in a bore 86 in the guide shoe 83. The bolt 8 1 may be welded to the shoe 83 at the point 8'7, and it is provided with an upwardly projecting threaded end 88 which passes through a slot 89 in the end 82 of the body 50.

The nut 90 and washer 91 on the bolt 84 prevent the shoe 83 from being forced in a clockwise direction by the obstructions which it may engage during the advancing motion of the pipe. The range of adjustment of the guide shoe 83 is illustrated by the dotted line position 92 in Fig. 8, which illustrates one or" the positions in which the guide shoe will frequently be used. Under these conditions it is ordinariiy not expected that there would be any clockwise force exerted upon the guide shoe 83, and the counterclockwise force upon the guide shoe 83 is resisted by means of an adjustment screw bolt 93 which passes through a threaded bore 94 in the end 82 of body 50 and engages the inside of the guide shoe 83. In some embodiments of the invention, therefore, one may dispense with the stop bolt 84, the adjustment screw 93 being utilized to determine the position of the guide shoe 83.

Referring to Figures 10 and 11, these are fragmentary views of another modification which may be very economicaliy constructed out of ordinary stock shapes and sizes of metal angle bars. This embodiment has the advantage of economy and simplicity and does not require the making of any special castings, but might be constructed in any work shop by means of ordinary tools out of the stock angle irons.

The supporting body 95 comprises a pair of angle irons 96 and 97, each having a vertically extending flange 98, 99 and a horizontally extending flange 100, 101. The horizontal flanges 100, 101 are provided with apertures 102 for receiving the screw bolts 103 wl ich pass through apertures 104 in the pipe and secure the angle irons 96, 97 to the pipe in spaced relation to each other. Tapered or curved spacers 105 between the horizontal flanges 100, 101 and the pipe give the horizontal flanges 100, 101 a greater bearing area against the interior of the pipe, the spacers being clamped between the flanges 100, 101 and the pipe 11.

The bolt holes 104 are so located that when the angle irons 90, 9'? are clamped on the pipe, the vertical flanges 98, 99 are spaced from each other a distance suiiicient to receive a pair of vertical flanges 106, 10'? upon larger angle irons which are utilized to construct the guide shoe 108. These angle irons are provided with horizontal flanges 109, 110 having a lower flat surface 111 which is ada ted to slidably en age the fill as the pipe progresses to effect a guiding action 01' the pipe. The vertical flanges 106, 107 of the guide shoe 108 in Fig. 11 may be secured together by a plurality of rivets 112 which pass through rivet apertures 113 and have their heads located flush withthe surface of the flanges 106, 107 due to the countersinking of the holes.

The vertically extending flanges 96, 9'? and 105, 107 of the angle irons are provided with registering apertures 11 1, 115. In the supporting body 95 the aperture 115 is located slightly in advance of the pipe 11. In the flanges 106, 10'? of the guide shoe 108, the apertures 115 are located in the upper rear corner. A hinge bolt 116 passes through the apertures 114, 115 and pivotally supports the guide shoe 108 upon the supporting body 95. At its forward end the supporting body 95 has its vertical flanges 96, 97 provided with registering apertures 117. These apertures are adapted to register with a pair of apertures 118 located in the vertical flanges 106, 107 of the guide shoe 108 and also located on the arcs of circles drawn with the axis of the belt 116 as a center.

A transverse screw bolt 119 passes through the apertures in the supporting body 95, and the screw bolt 119 is adapted to support the guide shoe 108 in any of a multiplicity of different angular positions. The apertures 11?, which are located at different radii from the bolt 116, are staggered with respect to each other so as to give a finer adjustment without causing the apertures to overlap.

Any of the guide shoes described herein may be attached directly to the pipe or they may be atattached to a cutting ring 33 of the type shown in Fig. 12. The guide shoes will be most commoniy used on the lower edge of the pipe, but any number of guide shoes may be used on the same pipe, and may be located at any point on the periphery of the pipe to correct or determine the direction of movement of the pipe.

The operation of the guide shoe is as follows: As the pipe progresses its grade and line are frequently checked and extra guide shoes may be applied by excavating around the end of the pipe, or the guide shoes which were previously applied may be adjusted so as to maintain the pipe at constant grade and a predetermined line. If desired, the grade of the pipe may be slightly changed as the pipe progresses to bring the end of the pipe into a predetermined position. The anguluar guide surfaces of the guide shoes are adapted to cam against the fill as the pipe pro gresses and to produce a component of force transverse to the direction of movement of the pipe. Naturally such a guide shoe also produces additional resistance in the form of a reactive component of force, but this factor is negligible in View of the great force which may be exerted by the jacks, and the disadvantage of increased resistance to the jacks is offset by the advantage of certainty in the location of the pipe in any predetermined position.

It will thus be observed that I have invented an improved method of placing concrete pipe and improved apparatus by means of which the pipe may be guided in its movement so as to assure the location of the pipe at correct grade and line. The present methods of placing pipe enable the installation of sewers, culverts and the like without disturbing the roadway or interrupting the use of the track or roadway and without the formation of soft spots in the track bed or roadway.

, positions, .saidhinge plate extending backwardly In most cases the use of, the present method effects .a material saving of time, labor andexpense. i i

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but de sire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim is new and desire to secure by Letters Patent of the United States is:

1. In an apparatus for the installation of pipe, the combination of a pipe with a deflector member comprising a metal body, means for securing one end of said body to the side of said pipe, the opposite end of said body being directed inward toward the center of said pipe at an obtuse angle to provide a deflector for deflecting the pipe into a predetermined position.

2. In an apparatus for the installation of pipe, the combination of a pipe with a deflector member comprising a metal body, means for securing one end of said body to the side of said pipe, the opposite end of said body being directed inward toward the center of said pipe at an obtuse angle to provide a deflector for deflecting the pipe into a predetermined position, said deflector having an angle iron on its side and fixedly secured thereto for engaging the end of the pipe, and transmitting the major portion of the thrust on said deflector to the end of the pipe.

3. In a guide shoe for guiding concrete pipe i into predetermined position, the combination of mounted between said pivot flanges and having oppositely extending deflector flanges adapted to be located at any of a multiplicity of different angular positions.

4. In a guide shoe for guiding concrete pipe into predetermined position, the combination of a pair of angle irons having a pair of attaching flanges extending in opposite directions and having a pair of pivot flanges located in spaced relation to each other, and a guide shoe pivotally mounted between said pivot flanges and having oppositely extending deflector flanges adapted to be located at any of a multiplicity of different angular positions, said pivot flanges and guide shoe being provided with a multiplicity of registering apertures adapted to receive a securing device for supporting said deflector in difierent angular positions.

5. In a device for installing pipe, the combination of a supporting body adapted to be secured to the wall of a concrete pipe with a hinge pin carried by said supporting body in advance of the major portion of said pipe and a deflector plate pivotally carried by said hinge pin for changing the direction of movement of said pipe as it is forced into place.

6. In a device for installing pipe, the combination of a supporting body adapted to be secured to the wall of a concrete pipe with a hinge pin carried by said supporting body in advance of said pipe, a deflector plate pivotally carried by said hinge pin for changing the direction of movement of said pipe as it is forced into place, and means for engaging said hinge plate and securing it in any of a plurality of predetermined angular on the outside of said pipe, and said latter means comprising a bolt passing through said body and pipe to engage said plate. I

7. In a' device for installingconcrete pipe, the combination of a pipe with a metal-supporting body fixedly secured to said pipe and projecting beyond the end of said pipe with a deflector plate pivotally mounted on said supporting body, and adjustable means interposed between said deflector plate and said supporting body for holding said deflector plate in any of a plurality of predetermined angular positions to produce a component of force transverse to the direction of movement of the pipe and predetermine the direction of movement of the pipe.

8. In a device for installing concrete pipe, the combination or" a pipe with a metal supporting body fixedly secured to said pipe and projecting beyond the end of said pipe with a deflector plate pivotally mounted on said supporting body, and

adjustable means interposed between said deflector plate and said supporting body for holding said deflector plate in any of a plurality of predetermined angular positions to produce a component of force transverse to the direction of movement of the pipe and predetermine the direction of movement of the pipe, said deflector plate projecting in advance of said pipe and being provided with laterally beveled surfaces to guide said pipe along a predetermined line.

9. In an apparatus for installing concrete pipe, a guide shoe comprising a metal member having an aperture for receiving a bolt for attachment to the end of the pipe, and an angle iron member fixedly secured to said metal member and having a transversely extending flange adapted to engage the end of the concrete pipe to take the thrust, said metal member having a part inclining inward toward the side of said angle iron member and toward the inside of the pipe in order to provide a deflecting surface for controlling the direction of movement of the pipe.

10. In an apparatus for installing concrete pipe, the combination of a pair of angle irons adapted to be fixedly secured to a concrete pipe with a pair of angle iron members fixedly secured together to form a member of T-shaped cross section, the joined flanges of said latter angle irons being pivotally mounted between the two firstmentioned angle irons forming a guiding surface advancing ahead of the pipe and extending angularly with respect to the direction of movement of the pipe to guide the pipe in its installation.

11. In an apparatus for installing concrete pipe, the combination of a pair of angle irons adapted to be fixedly secured to a concrete pipe with a pair of angle iron members fixedly secured together to form a member of T-shaped cross section, the joined flanges of said latter angle irons being pivotally mounted between the two firstmentioned angle irons forming a guide surface advancing ahead of the pipe and extending angularly with respect to the direction of movement of the pipe to guide the pipe in its installation, and means for supporting said T-shaped cross sectional member in predetermined angular position, comprising a member passing through all of said angle irons, said angle irons being provided with a plurality of holes to permit a multiplicity of angular adjustments.

l2..In a device for installing concrete pipe the combination of a concrete pipe with supporting body means fixedly secured to said pipe, movable deflector means carried by said supporting fill as the pipe progresses to produce a component of force transverse to the direction of movement of the pipe and predetermine the direction of movement of the pipe.

WALTER H. ROBERTSON. 

